Ideas of Chrysippus, by Theme

[Greek, 280 - 207 BCE, Born at Soli in Cilicia. A pupil of Arcesilaus. Head of the Stoic school in Athens.]

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1. Philosophy / A. Wisdom / 1. Nature of Wisdom
Wisdom for one instant is as good as wisdom for eternity
2. Reason / B. Laws of Thought / 2. Sufficient Reason
Chrysippus said the uncaused is non-existent
4. Formal Logic / B. Propositional Logic PL / 1. Propositional Logic
Stoic propositional logic is like chemistry - how atoms make molecules, not the innards of atoms
5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
Modus ponens is one of five inference rules identified by the Stoics
5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
Every proposition is either true or false
7. Existence / A. Nature of Existence / 8. Criterion for Existence
Chrysippus says action is the criterion for existence, which must be physical
7. Existence / E. Categories / 3. Proposed Categories
Stoics categories are Substrate, Quality, Disposition, and Relation
9. Objects / B. Unity of Objects / 3. Unity Problems / b. Cat and its tail
Dion and Theon coexist, but Theon lacks a foot. If Dion loses a foot, he ousts Theon?
9. Objects / E. Objects over Time / 2. Objects that Change
Change of matter doesn't destroy identity - in Dion and Theon change is a condition of identity
15. Nature of Minds / A. Nature of Mind / 7. Animal Minds
Dogs show reason in decisions made by elimination
16. Persons / F. Free Will / 2. Free Will Theories / a. Fate
Destiny is only a predisposing cause, not a sufficient cause
21. Aesthetics / C. Artistic Issues / 10. Art and Morality
Stoics say that beauty and goodness are equivalent and linked
22. Metaethics / B. The Good / 1. Goodness / d. Good as virtue
Living happily is nothing but living virtuously
22. Metaethics / B. The Good / 1. Goodness / f. Good as pleasure
Justice can be preserved if pleasure is a good, but not if it is the goal
Pleasure is not the good, because there are disgraceful pleasures
22. Metaethics / C. Ethics Foundations / 2. Source of Ethics / j. Ethics by convention
Stoics say justice is a part of nature, not just an invented principle
23. Ethics / A. Egoism / 2. Hedonism
People need nothing except corn and water
23. Ethics / C. Virtue Theory / 1. Virtue Theory / a. Nature of virtue
All virtue is good, but not always praised (as in not lusting after someone ugly)
23. Ethics / C. Virtue Theory / 1. Virtue Theory / b. Basis of virtue
Chrysippus says nothing is blameworthy, as everything conforms with the best nature
24. Applied Ethics / B. Moral Rights / 3. Animal Rights
We don't have obligations to animals as they aren't like us
25. Society / C. Political Doctrines / 3. Anarchism
Diogenes masturbated in public, wishing he could get rid of hunger so easily
27. Natural Reality / A. Physics / 1. Matter / e. Greek elements
Stoics say earth, air, fire and water are the primary elements
28. God / A. Divine Nature / 3. Divine Perfections
Stoics say that God the creator is the perfection of all animals
28. God / A. Divine Nature / 5. Divine Morality / d. God decrees morality
Stoics teach that law is identical with right reason, which is the will of Zeus
The source of all justice is Zeus and the universal nature
28. God / E. Attitudes to God / 1. Monotheism
Stoics teach that God is a unity, variously known as Mind, or Fate, or Jupiter